Ammonia Borane Oxidation at Gold Microelectrodes in Alkaline Solutions

Nagle, Lorraine C.; Rohan, James F.

doi:10.1149/1.2344842

Cited by 53 publications

(79 citation statements)

References 29 publications

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“…The second broad oxidation wave a2 seen at -0.30 V in Fig. 3 can be attributed to the direct oxidation of AB 15,16,19 according to Eq. 7.…”

Section: Electrooxidation Of Ab At Au Discmentioning

confidence: 94%

“…The oxidation of AB commences at -1.02 V which is 0.08 V more positive than that at a Au microdisc. 15 In the forward sweep an oxidation peak a1 was recorded at -0.84 V followed by a broad oxidation wave a2 from -0.49 to -0.10 V. The location of the anodic features a1 and a2 agree with those reported in our microdisc studies of AB and DMAB oxidation at Au 15,21 and with those reported by Finkelstein et al 25 They identified two regions of mass transport limited current for BH 3 17 for the oxidation of 20 mM AB in 2 M NaOH at 100 mV s -1 at a Au disc. They assigned this to electrooxidation of H 2 generated from the hydrolysis of AB which they confirmed by its disappearance upon the addition of thiourea which inhibits the recombination of surface hydrogen radicals.…”

Section: Electrooxidation Of Ab At Au Discmentioning

confidence: 99%

“…-6 cm 2 s −1 from a study of AB oxidation at a Au microdisc 15 . The value for n is in close agreement with the value of 6 which was found for the AB oxidation wave at -0.15 V vs.…”

Section: Electrooxidation Of Ab At Au Discmentioning

confidence: 99%

“…Direct oxidation of AB is a viable alternative that merits attention given its high capacity (5.2 Ah g -1 ) coupled to its high energy density The direct electro-oxidation of AB (Eqn. 2) has been investigated at a Au microdisc 15 and…”

Section: Introductionmentioning

confidence: 99%

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Nanoporous Gold Catalyst for Direct Ammonia Borane Fuel Cells

Nagle

Rohan

2011

J. Electrochem. Soc.

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Nanoporous gold (NPG) electrodes were fabricated in film and wire array formats by selectively dealloying Ag from Au0.18Ag0.82. The ammonia borane (AB) oxidation reaction was studied by cyclic voltammetry at the NPG electrodes. The onset potential for the oxidation at NPG in a wire array format shifted to more negative potentials than that observed at a Au disc and higher currents were realised. An onset potential of −1.30 V vs. SCE was recorded which is 0.28 V lower than that at a Au disc. The oxidation current for 20 mM AB in 1 M NaOH increased from 2.65 mA cm−2 at a Au disc to 13.1 mA cm−2 at a NPG wire array. NPG is a viable candidate as an anode catalyst for a direct ammonia borane fuel cell.

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“…The second broad oxidation wave a2 seen at -0.30 V in Fig. 3 can be attributed to the direct oxidation of AB 15,16,19 according to Eq. 7.…”

Section: Electrooxidation Of Ab At Au Discmentioning

confidence: 94%

Section: Electrooxidation Of Ab At Au Discmentioning

confidence: 99%

“…-6 cm 2 s −1 from a study of AB oxidation at a Au microdisc 15 . The value for n is in close agreement with the value of 6 which was found for the AB oxidation wave at -0.15 V vs.…”

Section: Electrooxidation Of Ab At Au Discmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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